The Squid Internet Object Cache is a web proxy/cache.
access control lists (ACLs) are ignored.
response to determine if a particular port is open on a victim host.
Therefore, the squid server may be used to conduct a port scan.
1) Do not run squid in acceleration-only mode.
2) Deinstall the squid port/package if you have it installed.
1) Upgrade your entire ports collection and rebuild the squid port.
corrected in the FreeBSD ports collection.